The majority of parents just say "Don't", and blithely go on their way, assuming that the kid is actually going to obey.
One thing Kuovonne has drilled into me is that I'm not allowed to just say "Don't" to DD. I have to give an explanation to DD as to why I don't want her doing a particular thing, then I have to have DD explain back to me why doing/touching/licking said thing is bad. It's time consuming but the overall results have been wonderful.
A hundred years ago, kids grew up with knives, guns, shearing and crushing equipment and livestock, and knew how to handle all of them.
Um, actually a lot of kids were crushed, burned, bitten or killed back then. My parents, aunts, and uncles are all in there 70's and grew up on farms. You'd have to add a several of them together to get a full two-hands worth of fingers and they are the ones that lived. <img src="/images/graemlins/tongue.gif" alt="" />
-Blast